Investigations Of Wind-induced Loads And Loads Correlation Of Super-tall Buildings Based On Syncrhonous Pressure Measurement Technique

As the economy develops rapidly. Achievements in architecture are remarkable. Recent years have seen numerous urban high-rise buildings. Wind-induced interference effects significantly increase wind loads among high-rise buildings and the wind loads is more obvious and complex than the single building.Based on the method of synchronous pressure measurement technique, this article studied wind induced interference effect of along-wind load, cross-wind load and twist-wind load from six different width ratios, four different height ratios, one or two interfering buildings. Different turbulence in exposure category B and different reference wind pressure are analyzed. Furthermore, this article summed up the road related laws among along-wind, cross-wind and twist-wind direction. The main conclusions of this study can be summarized as follows:1) For the twist-wind interference effect, interference effect is increased with the width ratio. When Br=0.4, the frequency of vortex shedding is close to the first frequency of the structure. The shedding vortices could lead to vortex-induced resonance and cause enhanced wind loads on the interfered building. At this moment, the maximum IF is 3 times more than that when vortex-induced resonance does not happen.2) For the along-wind interference effect, shade effect is very significant when interfering building is right in front of the interfered building. The larger the height ratio stands, the more obvious the interference effect becomes. When Hr=1.4, the maximum IF increases to 1.5. When two interfering buildings are in upstream (the angle of their connect line with the X axis is between 30 and 50°), the effect of interference is the most significant.3) For the cross-wind interference effect, the most significant effect of interference occurred when the frequency of vortex shedding is close to the first frequency of the structure. At this moment, vortex-induced resonance cause IF is 1.3 times more bigger than that when resonance does not happen. Furthermore, resonance becomes obvious when turbulence becomes slow. Interference effect is increased with the height ratio.4) When one or two interfering building with the side-by-side arrangement lead to the narrow pipe effect. When the distance between an interfered building and any one interfering building is smaller than 3b, along-wind interference effect is the most significant. When it is between 2.5 and 4.0, cross-wind interference effect is the most significant. When there is only one interfering building, the maximum IF is more than 1.4. When there are two interfering buildings, the maximum IF is more than 1.8. Twist-wind interference effect is increased with the distance between an interfered building and an interfering building, the maximum IF is more than 1.4. The lower the turbulence becomes, the more significant the interference effect is.5) When the wind-induced interference effect happens, the correlation between along-wind and cross-wind is notable is bigger than the date between twist-wind and along-wind or cross-wind. The maximum correlation coefficient is 0.7 and increased when turbulence decreases.The intensive investigations also use least-square method and robust regression method analyze IF in different turbulence, different height radios, different reference wind pressure. The investigations found the correlation between different factors and gained the quantitative relationship between these factors, through those methods, the complex test results are simplified.